Rename my_ndk_version_root to my_ndk_sysroot; and _include and _lib

prebuilts/ndk/current/platforms/android-19/arch-x86_64/usr/lib
is renamed to usr/lib64 to be more consistent with rest of
lib paths in x86_64 toolchain, which is multilib

See https://android-review.googlesource.com/#/c/92441/

Change-Id: I4e59245505d0fa87ae3608e81e715ccfcecc5ec8
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index 7f8a483..bda44f4 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -49,11 +49,11 @@
 # so we don't have race condition when the system libraries (such as libc, libstdc++) are also built in the tree.
 my_target_global_ld_dirs := \
     $(addprefix -L, $(patsubst %/,%,$(dir $(my_ndk_stl_shared_lib_fullpath))) \
-    $(my_ndk_version_root)/usr/lib) \
+    $(my_ndk_sysroot_lib)) \
     $(my_target_global_ld_dirs)
 my_target_global_ldflags := $(my_ndk_stl_shared_lib) $(my_target_global_ldflags)
-my_target_crtbegin_so_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtbegin_so.o)
-my_target_crtend_so_o := $(wildcard $(my_ndk_version_root)/usr/lib/crtend_so.o)
+my_target_crtbegin_so_o := $(wildcard $(my_ndk_sysroot_lib)/crtbegin_so.o)
+my_target_crtend_so_o := $(wildcard $(my_ndk_sysroot_lib)/crtend_so.o)
 endif
 $(linked_module): PRIVATE_TARGET_GLOBAL_LD_DIRS := $(my_target_global_ld_dirs)
 $(linked_module): PRIVATE_TARGET_GLOBAL_LDFLAGS := $(my_target_global_ldflags)